What to do with a worn-out sweater? Or one you accidentally washed in hot water? Don't sweat it; this simple craft turns your tattered cardigans, shrunken V-necks, or the kids' castoffs into cool coasters. Wash 100 percent wool in hot water, then dry with an agitator like jeans. After three rounds, sweaters should feel taut and feltlike. Use a pencil and a large-mouthed glass to trace circles onto the fabric, then snip out a set.